Nut-lock.



UNITE FREDERICK eREENnoE cANoNsRURG, PENNSYLVANI.

NUT-LOCK.

Specication of Letters Patent.

Patented-Dec. 10, `1907'.

. Application filed August 10. 1907. Serial No. 387.947.

. Toall 'whom 'it may concemf f Be it known that I, FREDERICK GREENE, ay

siding at Canonsburg, in the county of Washington and State ofPennsylvania, have invented certain new and useful Im rovements inNut-Locks, of which the fol owingis a specication, reference being hadtherein to t e accompanying drawing.`

This invention relates lto nut locks, and its primary object is toprovide simple but effective means for preventin the loosening of a nutafterl it has been app `ed to a bolt.

A further object of the invention is, to provide a nut of novelconstruction in combination with an expansible or compressible Washer,said washer serving to securely lock the nut in (pplsition againstrotation by vibration, or or ary wear, but permitting the removal of.the nut by means of a wrench.

The invention consists of a nut provided with an annular groove adjacent-to its inner side,4 to receive a compressible Washer, and a bolt formedwith an annular groove adapted to register with the groove of the nutand also receive said washer.

The invention furtherconsists 'of anut having an annular gioove toreceive a washer, and a sup lemental Washer seat, in combination wit anexpansible or com ressible Washer of copper, tin, or other rea ycompressible meta The construction of the improvement will be fullydescribed hereinafter, in connection with the accompan a part of thespec' cation, and itsnovel fea tures will be defined in the appendedclaims. In the drawing: Figure 1 is a side elevation of the improved nutlock ap lied to a bolt,

the'material through. which t e bolt extends being shown in section, F 2is asimilar view showing the position o the parts of the 4 nut lockafter the nut has been screwed home upon thel bolt, Fig. 3is a side or ee view of the supplemental Washer employe Fig. 4 is a plan of the same,Fig. 5 is a side elevation of the ex ansible washer constituting animortant eature of the invention. Fig. 6 a

lottom lan of Fig. 5, Fig. 7 is a side elevationof t e nut, Fig.- 8 isan elevation of the inner side of the nut,- and Fig. 9 is a verticalsectional view of the same.

rThe reference numeral 1 des' ates a bolt, here shown as extendingthrong a section of material 2, and formedadjacent to its inner drawingwhich forms thread with an annular groove 2a, of the same de th as thescrew. threads.

gon the threaded end of the bolt is fitte a nut 3. The inner face of thenut is countersunk as at 4, and between the coun.- tersunk ortion andthethreads of the nut an annular groove 5 is formed, which is of greaterdiameter than the diameter of the countersunk portion.

The com ressible washer 6 is of tapering or conical orm, and may beconstructed of copper, tin, or other readily compressible metal. Theedges of the washer are notched to facilitate its compression, thenotches 7 in ,the upper edge alternating with the notches 8 formed inthe lower edge.

In o eration a washer '9 isI slipped upon the bo t and upon this washer1s placed a smaller ring or washer 10 adapted to iit the countef'sunkportion of the nut. The com pressible washer' is then placed upon theolt with its smaller end restingv agamst the washer 10. The nut is'thenplaced in position, and when it is screwed to lace against the Washer 9,the compressib e washerv 6 Will be crushed `as illustrated in Fig. 2,with its smaller end in, filling the annular groove 2 of the bolt anditslarger end forced into the groove 5 of the nut. v

It will be a parent that when the nut has been screwed ome upon the boltto the position shown in Fig. 2, rotation of the nut by vibration or jarwill be im ossible. The nut may however be remove by means of a WrenchWithout injuring the threads of the bolt, and this constitutes animportant feature of the improvement.

I would have it understood that the invention includes all suchmodifications and changes in the minor details of the construction, asmay fall within the terms and scope of the following claims.

Havingnow described my invention what l Iclaimasnew,is:-

1. The combination with a grooved bolt, of a nut provided adjacent toits Inner face,

with an mternal annular groove registering with the groove of the'v boltand a compressicountersunk on its inner face and having an lnternalannular groove of greater diameter than the countersunk portion of thenut, of

a notched-washer of comlrlilressible material adaitilted to be crushedby t e screwing home of t e nut on the bolt and thereby forced into thesaid annular grooves of the saidnut and bolt respectively to lock thenut on the bolt.

3. In a nut lock, the combination with a bolt having an annular exteriorgroove and a nut having an interior annular groove, of a Washer ofcomp'ressible material having both edges thereof notched to facilitatecompression of the washer andthe entry thereof 15 into the grooves ofthe nut and bolt. In testimony whereof I a'lix my signature in thepresence of two witnesses.

FREDERICK GREENE. Witnesses:

WILL A. MCCONNELL, JAMES CALDWELL.

